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Preparation method for cathode active material of lithium ion battery

A negative electrode active material, lithium ion battery technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve the problems of uncontrollable material morphology, high energy consumption, affecting the electrochemical performance of materials, etc. The effect of migration, good rate performance and excellent cycle performance

Active Publication Date: 2013-02-06
MICROVAST POWER SYST CO LTD
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AI Technical Summary

Problems solved by technology

According to reports in the current literature, the synthesis of H 2 Ti 12 o 25 The precursor of Na 2 Ti 3 o 7 It is usually obtained by high-temperature solid-phase method, which requires mechanical mixing and long-term calcination, which not only consumes high energy, but also has uncontrollable material morphology during the preparation process, which affects the electrochemical performance of the material.

Method used

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  • Preparation method for cathode active material of lithium ion battery
  • Preparation method for cathode active material of lithium ion battery
  • Preparation method for cathode active material of lithium ion battery

Examples

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Embodiment 1

[0031] 1) Configuration solution A: Add 35.16g alkoxy titanium (AR), 250ml isopropanol (AR), 10.5ml glacial acetic acid (AR) and 4mL hydrochloric acid (AR) into the Erlenmeyer flask in turn; solution B: add 4.452 g sodium carbonate dissolved in 13.356 g deionized water;

[0032] 2) Mix the solution B and solution A obtained in 1) under stirring conditions, the stirring speed is 500r / min, the temperature is 20°C, and the dropping speed is controlled by a constant flow pump. After the dropping is completed, continue stirring for 1 hour to stop Stir and let stand for 20 hours;

[0033] 3) Dry the standing product obtained in 2) (100°C), and then bake at 800°C for 20 hours;

[0034] 4) Perform a proton exchange reaction on the roasted product obtained in 3), using a 1.2M hydrochloric acid solution at a ratio of 10g / L, and replace the hydrochloric acid every 24 hours. After repeating three times, wash the product with deionized water until there is no chloride ion present ;

[0...

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Abstract

The invention provides a preparation method for cathode active material titanic oxides (H2Ti12O25) of a lithium ion battery; and the preparation method comprises the following steps of: mixing an alkali metal salt and alkoxy titanium hydrolytic sol; drying and roasting an obtained sol so as to obtain a precursor M2Ti3O7 (M is alkali metal); carrying out proton exchange on the precursor M2Ti3O7 prepared in the step a) and hydrochloric acid, so as to obtain H2Ti3O7; and carrying out heat treatment on the H2Ti3O7 prepared in the step b), so as to obtain a target product H2Ti12O25. The titanium oxide H2Ti12O25 prepared by the method provided by the invention has the advantages of good rate capability and high cycling stability; and by using the material as an electrode active material, the lithium ion battery with excellent cycle performance can be prepared.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode active material of a lithium ion battery. Background technique [0002] At present, most of the secondary batteries loaded in portable electronic devices such as mobile phones and notebook computers are lithium ion secondary batteries. In addition, with the deteriorating environment, people's demand for green energy will become stronger and stronger, so the research on electric vehicles is in full swing, and the market demand will also increase. Therefore, lithium-ion secondary batteries as an integrated The importance of large-scale batteries such as power grids and power load leveling systems is increasing. [0003] Lithium-ion secondary batteries mainly include the following parts: positive and negative electrode materials that can reversibly absorb and release lithium ions, a separator that allows ions to pass through freely and is electronically insulated, and an electrolyte. ...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 郭会杰杰夫·徐
Owner MICROVAST POWER SYST CO LTD
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